Combination inside and outside micrometer-calipers.



A. G-. O. HIX.

commAroN INSIDE AND ouslDE MICROMETER CAMPERS.

APPLICATION FILED JULY 12.1911. v

Patentd June 18, 1918.

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ALFRED G. 0. ETX, 0F LOS ANGELES, CLIFRNIA.

Speccation of Letters Patent.

Patented il une 16, 1916..

Application led July 12, 1917. Serial No. 180,228.

To all 'whom it may concern Be it known that l, ALFRED G. U. HIX, acitizen of the United States, residing at Los Angeles, in the county ofLos Angeles and State of California, have invented a new` and usefulCombination Inside and Outside Micrometer-Calipers, of which thefollowing is a specification.

My invention relates to the machinists art, and more particularly to themeasuring devices usedin that art. Tt is often necessary for themachinist to measure accurately the thickness of materials or thediameter of a cylindrical surface or of a cylindrical cavity. Varioustypes of micrometers have been developed for this purpose, thesemicrometers depending upon the accuracy of a screw for their operation.The micrometers which have been previously developed may be dividedbroadly into two classes, those which are adapted to measure thethickness of a material, commonly called outside micrometers, and thosewhich are adapted to measuring openings, commonly called insidemicrometers.

The principal object of my invention is to incorporate in a singleinstrument a comn bined inside and outside micrometer caliper. Whilesuch a device may be used for all the diverse purposes to which eitheran inside or outside caliper is adapted, it has in addition certainpeculiar virtues of its own, due toy the associations of the twoinstruments as a single unity. This will perhaps be better understood ifa single application of such a caliper is described, and for thispurpose 1 have selected, illustrated, and will describe one of thecommonest uses to which such a caliper may be put. This particularapplication is the fitting of a cylindrical body into a cylindricalopening. This operation must be done whenever it is necessary to turn ashaft or bearing so that they will fit together. For convenience indescription, the cylindrical body y will be hereinafter referred toasthe shaft, and the body having the cylindrical opening will be referredto as the bearing.

A further object of my invention is to provide a caliper which can beset to turn lits between shafts and bearings, a single setting servingto measure both the shaft and the bearing.

,Further objects and advantages will be made evident hereinafter.

Referring to the drawings, which are for illustrative purposes only:

Figure 1 is aside elevation of the caliper, ka portion thereof beingbrokenaway, and shown in section, to better illustrate the invention.

Fig. 2 is a section on a plane represented by the line 2-2 Fig. 1, thisplane being plane represented hand slider 13. Formed on the right hand`slider 12 are a right hand outside jaw 14 and a right inside jaw 15.Formed in a similar manner on the slider 13 are a left hand outside jaw16 and a left hand inside jaw 17.

The jaws 14 and 15 are accurately ground so that the contact surfaces 20thereof are in a straight line 2l, which is at right angles to the axis22 `of the caliper. Tn the same manner, the jaws 16 and 17 are so groundthat their contact surfaces 20 are in a straight line 24 at right anglesto the axis 22 and parallel with the line21.

The bar 11 is provided with grooves 30 in either edge in whichprojections 31 on the sliders l2 and 13 project. Keys 32 having heads 33are provided in each of the sliders 12 and 13, these keys being clampedagainst the bar 11 by means of thumb screws `34. The bar 11 is providedwith a central slot 40 in which a spindle 41 turns. This spindle ispivoted at one end on a conical pin 42 and is turned down as shown at 43near its center to formy a journal turning freely in a. bearing 44formed from the material of the bar 11. A bearing cap 45 is secured byscrews 46 in the bar 11, as shown in Fig.` 2. The left hand end of thespindle 41 is threaded as shown in Fig. 1, and is engaged by a nut 47which is secured by means of screws 48 to the left hand slider 13. The

vided With-a key-50; which slides: in-a=.thread:

ed sleeiie lpri'gidly, :secured vinea calibraand the sleeve 51 isprovided 'with a'right hand thread. A, jacket 54 .isf .rigidly.rsecured,z` by means of pins 53, with relation to the bar 11, extending insidethe calibrationtube 52f-a'ndibeiiig threaded' on the sleeve 51.` Thejacket is further secured byk being-'lockedunder a projection on thebearing cap 45, as best shown in Fig. Calibrationl markings 55 arepro-vided on the jacketi54, and cali-4 brati'oiiinarkings 56'are-provided on the "bra'tion' tube 52' 'is provided with al 'cylindrical projection 57, which engages a projecj tin I58fierIIIiet-l-ion,theslider-12 and which inside aii'felonfgated 'projectionf 59'formed on' atheslider 13. f

The method of operationVA of my" invention the exterior of thistiibebeing knurled to prb'vi'de"\' a'= good-grip.` The vturning of thecali'brationti'ibef52lalsov turns the spindle 41,

dueto-the key 50;- v'Ags the-jacket 54y is statiena'ry, the 'turning 'ofthe'calibrationtube- 52?"move's itbl'ongitudinally.along the axis Q2,

due to tlie-l threads on they sleeve 51 Which turns inside the jacket54. As the spindle 4l turniiig,itl`ierefore, of the ca libiation'tubel52'1causes`the-f-javvs1141'and-i16 to approachl orf-recede fromfeac'hother, and the sliders 12 and 13 to `move alongthe bar 11. 'Any'movement-.of the'ja'ws14' andwl is exactly duplicated fby thejaws 15lan'd '17," and 'the'f interior dis'tancejbetween the jaws 14 and 16is'ialways exactly equalv to the' distance out-'- side the` javv's 16: vand" 17 ,f f the'lcalibrationmarkings `55 and 56 allowing this distanceto);

bei-'accurately determined.` It is, therefore,

possible"l te calipenoiitside the shaft shown` at" 100i,f vand the Ysamesetting` to lraccul` ratel'y "caliper inside the bearin'g'lOl.- B

' f sofdoin'gfrit isfpos'si'ble -to turn the'shaft 1005 or bore'outthebearing '101f-to' accurately tit.f

turningisuchf'ts'that my caliper is especially designed.

others'skilled 'in' the art "to `which it pertains, that numerousmodifications and refinements Atliereot are possible wit-hout departingfrom the/spirit .0f myA invention.

tion tube 52. The left hand end of the spinv dle 41 is provided vvith`-a left handthread,

` Ivltherefore desire it understood that all such' changes arecontemplated within the scope of my invention as expressed in theappended claims.

.I .claim as my invention: ,1. Acaliper comprising a bar; two sliderseach engaging said bar and movable axially-thereon; two? caliper jawseach ixcd l handedly threaded inside said jacket and slid'e's'f'ifreely'ini the direction-ot the'axisy 22 right hand end` ofsaidv spindle tosaid sleeve; f

means by which said sleeve actuates the j, right lhand" slider ;v andcalibration means by The thumb screws 33 being loosened up,`

which the separation betweenl the jaws can be accurately'determined.

2.' A caliper comprising-a bar; two slidersrf eachl yengaging said barand movable axiallytthereon; two caliper jaws each fixed to` one of;said sliders; a spindle turning freely with relation tosaid bar butrestrained to prevent axial movement with lrelation thereto ya' nutfixed to the left hand slider and engaging a left hand thread on theleft hand end of said spindle; a jacket lixed with relation toV said bara sleeve right handedly threaded inside said jacket and sliding looselyon the right hand end ofisaid spindie; va sliding key connecting theright hand endofsaid spindle tosaid sleeve; a calibrationtube lixed :tosaid sleeve and projecting oversaid jacketgmeans by which saidv tubeactu'ates the right hand slider; and' calibration means by which theseparation between the'jaws can be accurately determined.

`3.,A calipercoinprising a bar, two sliders eachiy engaging said bar andmovable axially-thereon; two caliper jaws each lixed to one ofsaidfsliders; a spindle turning freelyl with relation to said bar butrestrained to prevent axial movement with relation thereto; a nut fixedto ,the left hand slider` and engaging a left handthread on theleftfhand endofsaid spindle; a jacket ixedwithv relation 4to* said bar;a sleeve yI 1 righty handedly threa ded'- inside said, jacket .andsliding loosely v'on the right hand end of'isaid spindle;"`a sliding keyconnecting the rightfzhand endoflsaid spindle tosaid sleeve; aAcalibration tube fixed to `said sleeve `-andprojectingV over saidjacket;

, means by whichsaid vtube actuates the right handslider; andcalibration markings on f saidijacket and the edge ofsaid calibrationtube.

4. Afcombin'ed inside and'outside caliper 130 Leashes comprising a bar;two sliders each engaging said bar and movable axially thereon; twooutside caliper jaws each fixed to the top of one of said sliders; twoinside caliper jaws each fixed to the bottom of one of said sliders; thecontact surfaces of the inside and the outside jaw of each slider beingin the same straight line which is at right angles to the axis of thecaliper; a spindle turning freely with relation to said bar butrestrained to prevent axial movement with relation thereto; a nut fixedto the left hand slider and engaging a left hand thread on the left handend of said spindle; means for rotating said spindle; right hand threadmeans operated in conjunction with the right hand endvof said spindle;means by which said right hand thread means moves the right hand slider;and calibration means by which the separation between the jaws can beaccurately determined.

5. A combined inside and outside caliper comprising a bar; two sliderseach engaging said bar and movable axially thereon; two outside caliperjaws each fixed to the top of one of said sliders; two inside caliperjaws each xed to the bottom of one of said sliders, the Contact surfacesof the inside and the outside jaw of each slider being in the samestraight line which is at right angles to the axis of the caliper; aspindle turning freely with relation to said bar but restrained to prevent axial movement with relation thereto; a nut iixed to the left handslider and engaging a left hand thread on the left hand end of saidspindle; a jacket fixed with relation to said bar; a sleeve righthandedly threaded inside said jacket and sliding loosely on the righthand end of said spindle; a sliding key connecting the right hand end ofsaid spindle to said sleeve; means by which said sleeve actuates theright hand slider; and calibration means by which the separation betweenthe jaws can be accurately determined.

6. A combined inside and outside caliper comprising a bar; two sliderseach engaging said bar and movable axially thereon; two outside caliperjaws each fixed to the to 3 of one of said sliders; two inside caliperjaws Copies of this patent may be obtained for ve cents each, by

each fixed to the bottoni of one of said sliders, the contact surfacesof the inside and the outside jaw of each slider being in the samestraight line which is at right angles to the axis of the caliper; aspindle turning freely with relation to said bar but restrained toprevent axial movement with relation thereto; a nut fixed to the lefthand slider and en gaging a left hand thread on the left hand end ofsaid spindle; a jacket fixed with rela tion to said bar; a sleeve righthandedly threaded inside said jacket and sliding loosely on the righthand end of said spindle; a sliding key connecting the right hand end ofsaid spindle to said sleeve; a ca-libra tion tube fixed to said sleeveand projecting over said jacket; means by which said tube actuates theright hand slider; and calibration means by which the separation betweenthe jaws can be accurately determined.

7. A combined inside and outside caliper comprising a bar; two sliderseach engaging said bar and movable axially thereon; two outside caliperjaws each fixed to the top of one of said sliders; two inside caliperjaws each fixed to the bottom of one of said sliders, the contactsurfaces of the inside and the outside jaw of each slider being in thesame straight line which is at right angles to the axis of the caliper;a spindle turning freely with relation to said bar but restrained toprevent axial movement with relation there to; a nut fixed to the lefthand slider and engaging aleft hand thread on the left hand end of saidspindle; a jacket lixed with relation to said bar; a sleeve righthandedly threaded inside said jacket and sliding loosely on the righthand end of said spindle; a sliding key connecting the right hand end ofsaid spindle to said sleeve; a calibration tube fixed to said sleeve andprojecting over said jacket; means by which said tube actuates the righthand slider; and calibration markings on said jacket and the edge ofsaid calibration tube.

In testimony whereof, I have hereunto set my hand at Los Angeles;California, this 30th day of June7 191 ALFRED Gr. O. HlX.

addressing the Gommissioner of Patents,

Washington, D. C.

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